use Taylor series near 1 and 2

[TSGut]

Fix #8

Complex already did this so it is a minimal change that should resolve the inaccuracies near 1 and 2.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (fcf2692) to head (f8661f7).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #10   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          303       309    +6     
=========================================
+ Hits           303       309    +6     

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[TSGut]

I think this is ready for merge or review.

[oscardssmith]

From my testing, it seems like this is only an issue on the left side of the root, but this is probably faster anyway (will benchmark), but merging for now since this is a bugfix.